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TDR Testing and Fault Location
6
The TDR Toolbox
Pair 1 waveform data is used as the reference, and Pair 2 data is subtracted
from it to obtain the "difference" waveform. If both pairs are identical (have
exactly the same waveforms), the result is a straight line with no reflections.
The TDR softkeys operate in the same manner as those on the Pair 1 test result
screen (see "Pair 1 Test" and Table 6-3 for descriptions).
Pair 1 Monitor
The Pair 1 Monitor test can help you track down intermittent faults. The test
operates continuously (like the Pair 1 Test), but the CopperPro records
waveform differences over time on the screen.
Figure 6-4 shows the results from a Pair 1 Monitor test that was conducted on
a pair with an intermittent splice connection.
acy74s.eps
Figure 6-4. Pair 1 Monitor Test Result: Intermittent Splice
6-15
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